/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
using System;
using java = biz.ritter.javapi;

namespace org.apache.commons.compress.changes{



    /**
     * ChangeSet collects and performs changes to an archive.
     * Putting delete changes in this ChangeSet from multiple threads can
     * cause conflicts.
     * 
     * @NotThreadSafe
     */
    public sealed class ChangeSet {

        private readonly java.util.Set<Change> changes = new java.util.LinkedHashSet<Change>();

        /**
         * Deletes the file with the filename from the archive. 
         * 
         * @param filename
         *            the filename of the file to delete
         */
        public void delete(String filename) {
            addDeletion(new Change(filename, Change.TYPE_DELETE));
        }

        /**
         * Deletes the directory tree from the archive. 
         * 
         * @param dirName
         *            the name of the directory tree to delete
         */
        public void deleteDir(String dirName) {
            addDeletion(new Change(dirName, Change.TYPE_DELETE_DIR));
        }
    
        /**
         * Adds a new archive entry to the archive.
         * 
         * @param pEntry
         *            the entry to add
         * @param pInput
         *            the datastream to add
         */
        public void add(org.apache.commons.compress.archivers.ArchiveEntry pEntry, java.io.InputStream pInput) {
            this.add(pEntry, pInput, true);
        }
    
        /**
         * Adds a new archive entry to the archive.
         * If replace is set to true, this change will replace all other additions
         * done in this ChangeSet and all existing entries in the original stream.
         * 
         * @param pEntry
         *            the entry to add
         * @param pInput
         *            the datastream to add
         * @param replace
         *            indicates the this change should replace existing entries            
         */
        public void add(org.apache.commons.compress.archivers.ArchiveEntry pEntry, java.io.InputStream pInput, bool replace) {
            addAddition(new Change(pEntry, pInput, replace));
        }

        /**
         * Adds an addition change.
         * 
         * @param pChange
         *            the change which should result in an addition
         */
        private void addAddition(Change pChange) {
            if (Change.TYPE_ADD != pChange.type() ||    
                pChange.getInput() == null) {
                return;
            }

            if (!changes.isEmpty()) {
                for (java.util.Iterator<Change> it = changes.iterator(); it.hasNext();) {
                    Change change = it.next();
                    if (change.type() == Change.TYPE_ADD && change.getEntry() != null) {
                        org.apache.commons.compress.archivers.ArchiveEntry entry = change.getEntry();
                        if(entry.equals(pChange.getEntry())) {
                            if(pChange.isReplaceMode()) {
                                it.remove();
                                changes.add(pChange);
                                return;
                            } else {
                                // do not add this change
                                return;
                            }
                        }
                    }
                }
            }
            changes.add(pChange);
        }
    
        /**
         * Adds an delete change.
         * 
         * @param pChange
         *            the change which should result in a deletion
         */
        private void addDeletion(Change pChange) {
            if ((Change.TYPE_DELETE != pChange.type() &&
                Change.TYPE_DELETE_DIR != pChange.type()) ||    
                pChange.targetFile() == null) {
                return;
            }
            String source = pChange.targetFile();

            if (!changes.isEmpty()) {
                for (java.util.Iterator<Change> it = changes.iterator(); it.hasNext();) {
                    Change change = (Change) it.next();
                    if (change.type() == Change.TYPE_ADD
                            && change.getEntry() != null) {
                        String target = change.getEntry().getName();

                        if (Change.TYPE_DELETE == pChange.type() && source.equals(target)) {
                            it.remove();
                        } else if (Change.TYPE_DELETE_DIR == pChange.type() && 
                                   target.matches(source + "/.*")) {
                            it.remove();
                        }
                    }
                }
            }
            changes.add(pChange);
        }

        /**
         * Returns the list of changes as a copy. Changes on this set
         * are not reflected on this ChangeSet and vice versa.
         * @return the changes as a copy
         */
        internal java.util.Set<Change> getChanges() {
            return new java.util.LinkedHashSet<Change>(changes);
        }
    }
}